Improper certificate validation in macOS - CVE-2026-86889
Published: September 15, 2026
Vulnerability identifier: #VU149859
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-86889
CWE-ID: CWE-295
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform MitM attack.
The vulnerability exists due to improper certificate validation in Security component. A remote attacker on the local network can intercept network traffic.
Affected software
macOS
How to mitigate CVE-2026-86889
Install updates from vendor's website.
macOS - addressed in versions 26.7 25G229, 15.8 24H23